Sleepy Ash

Kuro (クロ), also referred to as Sleepy Ash or Sloth, is the deuteragonist of Servamp. Kuro, named by his Eve, Mahiru Shirota, is the Servamp of Sloth. He is the oldest of the eight Servamps. When he is exposed to sunlight, he transforms into a black cat.

If Kuro is not in his cat form, he has shoulder-length, blue hair with his front bangs reaching his eyes. His eye color is red and he has big, dark bags under them. They are always half-lidded and express a feeling of boredom. Just like any other vampire, he has pointed teeth.Kuro mostly wears a blue jacket which is a tad darker than his hair color with the hood pulled over his head, the black fur looking close to the one of his cat form. He also has a patch on his left shoulder with the Roman numeral 1, probably because he is the oldest of the seven sins. He is wearing the bell Mahiru gave him as their contract symbol around his neck as sometimes seen in official illustrations, which is apart from that mostly hidden under his clothes. His blue jacket is often buttoned open, either a simple black or white shirt hiding under it. On both sides, Kuro has chest pockets. The hem of his jacket splits into many threads, starting short at the front but grow in length as they reach his back. His white pants are skin-tight and held up with a red belt, which is rarely seen. Kuro wears long, black boots that almost reach his knees.

Kuro is actually taller than he seems since he always walks around with a hunched posture and hands in his pockets.

As a cat, Kuro has black fur and red eyes. Around his neck he is wearing Mahiru's bell as a collar with red leather. His tail splits at its end into four, close to the threads at the back of his jacket in his human form.

Personality
Being the Servamp of Sloth, Kuro spends his time sleeping, lazing around or playing video games. He feels no shame in running away to avoid any trouble and refuses to take decisions for he doesn't want anything to be his fault, and he doesn't want to disappoint anyone. Kuro is a pacifist vampire, and rarely drinks Mahiru's blood, most of the time he refuses and drinks only when he is about to fight. He also refuses to turn any humans into vampires to make them his subclass, saying that they probably didn't want to become vampires, and that vampires shouldn't even exist. He prefers staying at home rather than going out and seems to dislike the changes of temperature, according to him vampires are delicate to this.

History
Not much is said about Kuro's past in the early volumes, but it shows that he has a strong hatred towards the C3, the neutral group. Kuro's inner demon mentions that the C3 brings back bad memories and something happened between them, which he calls the "incident." It is also mentioned that he used to work with them.

When approached with the decision to kill a certain person, the creator of the servamps by the C3, he made the final decision. Kuro decided that they should kill their creator and he would be the one to do it. While Kuro had a conversation with their creator and ultimately killed him he was greatly conflicted on whether it was the right thing to do and this uncertainty haunted him even into the present. He finally confronts his past while turned into a black ball which Mahiru goes into and sees his past and inner demons. While Kuro asks for him to tell him if what he did was right or not, Mahiru tells him that the one who can decide if it was right or not is him and then headbutts him.

Story
Kuro is the vampire of Sloth and Servamp of Shirota Mahiru. He is the oldest of the 7 deadly sins, including Pride, Envy, Wrath, Greed, Gluttony, Lust, and the new addition, Melancholy. He can take the form of a black cat or a human. He became the Servamp of Mahiru after Mahiru called him by the name "Kuro" and offered him a bell, and after Kuro drank Mahiru's blood.

The story began when a threat of a new vampire appeared; Tsubaki, vampire of Melancholy. He is a homicidal monster who wants to start a war between vampires and humans. Kuro and Mahiru are trying to gather all the seven true Servamps and their masters to bring down Tsubaki.

Abilities
Transforming Servamp Bond Claws Speed and Flight Endurance Inner Power Jacket Tails
 * Kuro can change into a black cat and into his human form at will. He can also speak when he is in his cat form. But, when he is exposed to sunlight, he automatically reverts back to his cat form. It is later revealed that he can turn into a giant lion.
 * When he drinks Mahiru's blood, the chain connecting them is visible and he appears to become more powerful.
 * He can extend his nails into long, sharp black claws, easily able to cut and skewer people and other vampires.
 * He is shown to have incredible speed and can jump high very easily, also shown that he is able to fly.
 * Since he is immortal, he can't die. But, he heals very quickly and he was still able to fight even when he was stabbed through with a sword and still stood protecting Mahiru when he was being slashed at back and forth by knives. He was also knocked out by being shot at in the back by Envy's barrel gun.
 * When his control of his power was gone, he was much more faster, powerful, and ruthless; also unaware of what he is doing. He was shown beating Berukia, one of Tsubaki's servants, mercilessly. He grabbed Berukia's hair and was about to bite off his neck to kill him, revealing a new set of long, sharp canines, and he would have too if Mahiru hadn't stopped him by pulling on the chain around his neck and Envy knocking him out with his gun. He even hurt Mahiru in the process; grabbing his face with his claws, leaving three thick scratch marks above his right eye, and roughly biting him down on his neck.
 * He can move and use the tails at the end of his jacket to fight.

Shirota Mahiru (Eve)
For hundreds of years Kuro didn't have an Eve until Mahiru picked him up thus making them partners. He cares deeply for Mahiru despite his lazy attitude as it is shown being forced to separate from Mahiru gets him mad. He worries for Mahiru and is scared to lose Mahiru's trust in him.

C3
Kuro is shown to have a strong hatred for C3, the neutral group. He even yelled at Mahiru when he suggested if they could get C3's help. Before, when Wrath had an idea on who could help them against Tsubaki, and was about to suggest it to Kuro, Mahiru, and Gluttony, Kuro suddenly tensed up and accidentally spilled his drink. This may indicate that Wrath was about to suggest the help of C3. Also, Kuro had received a letter from C3, asking for his help, but he ignored it. Later on, when Kuro and Mahiru were captured by C3, and were escaping, Kuro's inner demon that controls his power was taunting him by saying that C3 brings back bad memories and that they should trash something up since they both still really hate C3, indicating that Kuro had a past with them. His inner demon also said something about the 'incident' that happened with C3, and that if Mahiru ever find out, would he still trust him? This suggests that something really bad happened between him and the industry.

Quotes

 * "Ahhh...Now you're happy. Silly cat...Mahiru made you feel good...Right? But C3 brings back bad memories. If Mahiru discovers the 'Incident'...Will he still trust you? Are you worried? Mahiru's still a rookie...Happy birthday! You contradict yourself. You keep it all inside. You poor, pathetic boy! While we're at C3...Wanna trash something? After all, we still really hate them! Am I right?" (Kuro's inner demon taunting Kuro.)
 * "What you call simple, I call nagging." (to Mahiru.)
 * "Cat abuser." (to Mahiru)
 * "Paranoia's not my thing...Unlike you. Why look for trouble?"  (to Mahiru)
 * "Look at me guys...My cuteness will calm you..." (to the arguing Misono and Mahiru)
 * "Are you ever sorry...you found me...?" (to Mahiru)
 * "The pain! Wish I could die...But I can't." (Kuro complaining after escaping Tsubaki)
 * "Well, that's that! You are my master." (to Mahiru after drinking his blood, completing the contract)
 * "You'll...be the death of me." (to Mahiru after being stabbed to protect Mahiru)
 * "You are such a pain..." (to Mahiru)
 * "Close that! I hate sunlight..." (to Mahiru)
 * "I'm just your friendly neighborhood vampire." (to Mahiru)
 * "Humans are soo cruel...Meanie!" (to Mahiru)
 * "But the sun will kill me! Okay, I'm immortal. But still! Meeow!" (to Mahiru)
 * "We mix like oil and water." (to Mahiru)
 * "Reeeowr! Shame on you! Sucking up your cute little pet!" (Kuro complaining after Mahiru used the vacuum on him)
 * "Vampires don't age...Plus, I have a baby face." (Kuro to Mahiru)
 * "She hit me with a broom..." (Kuro to Mahiru after taking out the trash)
 * "Owww! The agony! An apple juice might help! Or a cola..." (to Mahiru)
 * "You read too much manga." (to Mahiru)
 * "Yes mommy..." (Kuro teasing Mahiru)
 * "Me want ramen! Yumm..." (to Mahiru)
 * "I follow your sign. If cancer gets bad news, I wanna know. And protect myself!" (to Mahiru)
 * "You always give one hundred and ten percent...that's way too much. Sit down." (to Mahiru who kept helping everyone who needed it)
 * "And never force  him(Mahiru) to do that again." (Kuro threatening the C3 employees after Mahiru had to use a dangerous amount of power to break out, causing Mahiru harm in the process)
 * "Where's Mahiru?" (Kuro to the C3 employees, mad that he was apart from Mahiru, putting Mahiru in danger)
 * "Housewife." (Kuro teasing Mahiru)
 * "Aww...It's okay. I just say, 'He told me to do it.' Free will is overrated." (to one of Berukia about Mahiru)
 * "Mahiru...do you trust me?" (to Mahiru)
 * "I have...lots...of them. But...I...can't tell you. Some things you shouldn't know. Some things...could kill you." (to Mahiru after he asked if he had anymore secrets)

Trivia

 * "Kuro" (クロ) literally translates into "black"
 * His favorite food is instant ramen and potato chips (with bouillon flavor)
 * His favorite ice cream flavor is cookie-and-cream
 * He dislikes the sound of the alarm clock and the vacuum cleaner
 * His hobbies are playing video games and looking for a comfortable pillow
 * His favorite color is black
 * In official illustrations Kuro is often drawn in both his cat and human form
 * His catch phrase is 「めんどくせー」 (mendokuse) which roughly translates into "what a pain"
 * Kuro is also often shown in Chibi style (when he's in human form)
 * He hates vanilla ice-cream
 * He has a hatred for the C3
 * Kuro is the oldest of the 7 servamps (8 including Tsubaki)
 * He claims to dislike drinking blood from Mahiru
 * He is scared of his youngest sibling, Tsubaki
 * He is Sloth, and his other siblings are, from oldest to youngest: Pride, Envy, Wrath, Greed, Gluttony, Lust, and Melancholy
 * He is known as Kuro, Sleepy Ash, and Sloth
 * He cares a lot about Mahiru even when he doesn't show it and gets genuinely worried and mad when he is forced apart from Mahiru, putting Mahiru in danger
 * Kuro becomes happy whenever Mahiru calls them partners
 * In his cat form, a lot of girls at Mahiru's school find him adorable and sometimes dress him up in girly outfits
 * He hates sunlight
 * He is worried about losing Mahiru's trust
 * Whenever Kuro really has to drink Mahiru's blood, he always does it in his cat form and bites him on the arm or leg, never his neck
 * Kuro rarely drinks blood, and when offered, he rejects the idea or makes an excuse, preferring to eat junk food instead; the reason is unknown yet
 * He has a patch on his left shoulder with the Roman numeral 1, probably because he is the oldest of the seven deadly sins; Snow Lily also has a patch on his left shoulder with the Roman numeral 7.